20 sq. ft. top load filter

The Unicel 4CH-925 hot tub filter has a closed top with semi-circular handle and 1-½ inch course SAE male threads on the bottom that fits select Strong Spa models. Hot tub manufacturers can vary the filter size for the same model. Therefore it’s best to confirm that this filter is the same size as the filter in your Strong Spas model before ordering to ensure proper fitment. Filter details: Unicel P/N: 4CH-925 Diameter: 4-5/8" Length: 7-1/4" Top: Handle Bottom: 1-1/2" SAE Thread 20 sq.ft. Filter Media: 3oz Pleat count: 190 Also compatible replacement for: PSANT20P3 Filbur FC-0126. How Long do Unicel brand filters last? While most hot tub filters need to be changed every six to twelve months, Unicel brand filters are premium high-quality filters that can last up to two years or more, depending on your level of use and cleaning routine.